[pangomm] Doxyfile.in: Remove obsolete glibmm configuration constants

[Kjell Ahlstedt <kjellahl src gnome org>]

commit bf29962a4c6676057ce96798032166ab2943492a
Author: Kjell Ahlstedt <kjellahlstedt gmail com>
Date:   Thu Mar 21 16:16:37 2019 +0100

    Doxyfile.in: Remove obsolete glibmm configuration constants
    
    They have been removed from glibmm. See issue glibmm#22.

 docs/reference/Doxyfile.in | 4 ----
 1 file changed, 4 deletions(-)
---
diff --git a/docs/reference/Doxyfile.in b/docs/reference/Doxyfile.in
index 0274aab..af684ec 100644
--- a/docs/reference/Doxyfile.in
+++ b/docs/reference/Doxyfile.in
@@ -287,11 +287,7 @@ PREDEFINED             = __cplusplus \
                          "G_GNUC_NORETURN=" \
                          "G_GNUC_NULL_TERMINATED=" \
                          "G_GNUC_PURE=" \
-                         GLIBMM_DEFAULT_SIGNAL_HANDLERS_ENABLED \
-                         GLIBMM_EXCEPTIONS_ENABLED \
                          GLIBMM_HAVE_WIDE_STREAM \
-                         GLIBMM_PROPERTIES_ENABLED \
-                         GLIBMM_VFUNCS_ENABLED \
                          "PANGOMM_API="
 EXPAND_AS_DEFINED      = PANGOMM_MAJOR_VERSION \
                          PANGOMM_MINOR_VERSION \